From 60fdba40ae6e81231308bfeb38ca528c23ed1468 Mon Sep 17 00:00:00 2001
From: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Date: Mon, 20 Jul 2020 15:32:00 +0200
Subject: [PATCH] fwi: Use 4_MPI_ompss variant.

The -D_GNU_SOURCE define is required before mcc includes nanos6.h
---
 bsc/apps/fwi/default.nix | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/bsc/apps/fwi/default.nix b/bsc/apps/fwi/default.nix
index 3909bf3..2a97508 100644
--- a/bsc/apps/fwi/default.nix
+++ b/bsc/apps/fwi/default.nix
@@ -9,13 +9,16 @@
 
 stdenv.mkDerivation rec {
   name = "nbody";
+  variant = "4_MPI_ompss";
 
   src = builtins.fetchGit {
     url = "https://gitlab.com/srodrb/BSC-FWI.git";
-    ref = "ompss";
+    ref = "ompss-mpi-nocache";
   };
 
-  postUnpack = "sourceRoot=$sourceRoot/3_ompss";
+  postUnpack = "sourceRoot=$sourceRoot/${variant}";
+
+  enableParallelBuilding = true;
 
   buildInputs = [
     nanos6
@@ -25,6 +28,22 @@ stdenv.mkDerivation rec {
     mcxx
   ];
 
+  # FIXME: This is an ugly hack.
+  # When using _GNU_SOURCE or any other definition used in features.h, we need
+  # to define them before mcc includes nanos6.h from the command line. So the
+  # only chance is by setting it at the command line with -D. Using the DEFINES
+  # below, reaches the command line of the preprocessing stage with gcc.
+  preBuild = ''
+    export DEFINES=-D_GNU_SOURCE
+  '';
+
+  makeFlags = [
+    "NZF=108"
+    "NXF=108"
+    "NYF=208"
+    "PRECISION=float"
+  ];
+
   installPhase = ''
     mkdir -p $out/bin
     cp fwi.* $out/bin